I haven't heard the others, but I love my D1. I pair it with both my Little Dot and my Meier Jazz amps...it's a well built, solid little DAC. I actually want to buy another one so I can keep one in place in my main headphone rig and have another one to move about the house. Very hard to beat for $169, plus you get a capable headamp to boot...I use it primarily as a backup, but I know with my Grados it sounds surprisingly good. Lots of good options out there, though!

This is incorrect. ODAC is closed source—as for why, there's an official version and some alternate takes (conspiracy theories), in case you're interested. More info, a link to the schematic, and a picture of the PCB here:

ODAC resellers like JDSLabs, Audio Poutine, Epiphany Acoustics, and everybody else, buy the boards from the one actual source that's getting them made.

HRT MS II supports 32 kHz and 88.2 kHz in addition to the more standard 44.1 kHz, 48 kHz, and 96 kHz that both support. Both can do 24-bit operation as well as 16-bit. So I guess if you have music at 88.2 kHz sampling rate (pretty rare), the MS II means you can handle that without sample rate conversion. I'm not sure about the Audioengine D1 (over USB).

If you believe their listed specs, it looks like the MS II has a little bit more noise, but that's definitely not going to matter when using the Little Dot MKII and not with the HD 650 either. You might need very sensitive IEMs, a quiet room, and a really low-noise amp to tell the difference from background hiss, I'd guess.

This is incorrect. ODAC is closed source—as for why, there's an official version and some alternate takes (conspiracy theories), in case you're interested. More info, a link to the schematic, and a picture of the PCB here:

ODAC resellers like JDSLabs, Audio Poutine, Epiphany Acoustics, and everybody else, buy the boards from the one actual source that's getting them made.

HRT MS II supports 32 kHz and 88.2 kHz in addition to the more standard 44.1 kHz, 48 kHz, and 96 kHz that both support. Both can do 24-bit operation as well as 16-bit. So I guess if you have music at 88.2 kHz sampling rate (pretty rare), the MS II means you can handle that without sample rate conversion. I'm not sure about the Audioengine D1 (over USB).

If you believe their listed specs, it looks like the MS II has a little bit more noise, but that's definitely not going to matter when using the Little Dot MKII and not with the HD 650 either. You might need very sensitive IEMs, a quiet room, and a really low-noise amp to tell the difference from background hiss, I'd guess.

Alright that explain it all

About the ODAC

I see some diffrenses in the prices of them

Are they all going to give me the same performance since the board is one ?

My mistake. I falsely thought that since the O2 was open source and that the designer of the ODAC is licensing its design for no personal profit, it was also open source. A quick read has proven my first statement as incorrect.

Quote:

Originally Posted by mikeaj

This is incorrect. ODAC is closed source—as for why, there's an official version and some alternate takes (conspiracy theories), in case you're interested. More info, a link to the schematic, and a picture of the PCB here:http://www.yoyodyneconsulting.ca/pages/ODAC.html

ODAC resellers like JDSLabs, Audio Poutine, Epiphany Acoustics, and everybody else, buy the boards from the one actual source that's getting them made.

HRT MS II supports 32 kHz and 88.2 kHz in addition to the more standard 44.1 kHz, 48 kHz, and 96 kHz that both support. Both can do 24-bit operation as well as 16-bit. So I guess if you have music at 88.2 kHz sampling rate (pretty rare), the MS II means you can handle that without sample rate conversion. I'm not sure about the Audioengine D1 (over USB).

If you believe their listed specs, it looks like the MS II has a little bit more noise, but that's definitely not going to matter when using the Little Dot MKII and not with the HD 650 either. You might need very sensitive IEMs, a quiet room, and a really low-noise amp to tell the difference from background hiss, I'd guess.